Panasonic PT-RS20K Operating Instructions Manual page 47

Formula for calculating the projection distance per projection lens
To use a projected image size not listed in this manual, check the projected image size SD (m) and use the
respective formula to calculate projection distance.
The unit of all the formulae is m. (Values obtained by the following calculation formulae contain a slight error.)
When calculating a projection distance using image size designation (value in inches), multiply the value in inches
by 0.0254 and substitute it into SD in the formula for calculating the projection distance.
For PT-RZ21K
r Zoom Lens
Projection lens Model No.
ET-D75LE6
ET-D75LE10
ET-D75LE20
ET-D75LE30
ET-D75LE40
ET-D75LE8
r Fixed-focus Lens
Projection lens Model No.
ET-D75LE95
ET-D75LE90
Projection lens Model No.
ET-D75LE50
Chapter 2 Getting Started — Setting up
Throw ratio Aspect ratio
0.924 - 1.10:1 16:10
0.924 - 1.10:1 16:9
1.12 - 1.32:1 4:3
1.30 - 1.67:1 16:10
1.30 - 1.67:1 16:9
1.56 - 2.01:1 4:3
1.67 - 2.41:1 16:10
1.67 - 2.41:1 16:9
2.00 - 2.90:1 4:3
2.40 - 4.66:1 16:10
2.41 - 4.66:1 16:9
2.89 - 5.60:1 4:3
4.62 - 7.38:1 16:10
4.62 - 7.38:1 16:9
5.55 - 8.86:1 4:3
7.34 - 13.8:1 16:10
7.34 - 13.8:1 16:9
8.82 - 16.6:1 4:3
Throw ratio Aspect ratio
0.364:1 16:10
0.364:1 16:9
0.436:1 4:3
0.364:1 16:10
0.364:1 16:9
0.436:1 4:3
Throw ratio Aspect ratio
0.694:1 16:10
0.695:1 16:9
0.836:1
Projection distance (L) formula
Min. (LW)
= 0.7979 x SD - 0.0566
= 0.8201 x SD - 0.0566
= 0.9032 x SD - 0.0566
= 1.1186 x SD - 0.0857
= 1.1497 x SD - 0.0857
= 1.2663 x SD - 0.0857
= 1.4312 x SD - 0.0832
= 1.4709 x SD - 0.0832
= 1.6202 x SD - 0.0832
= 2.0647 x SD - 0.1131
= 2.1221 x SD - 0.1131
= 2.3374 x SD - 0.1131
= 3.9532 x SD - 0.1577
= 4.0631 x SD - 0.1577
= 4.4754 x SD - 0.1577
= 6.3193 x SD - 0.3862
= 6.4950 x SD - 0.3862
= 7.1540 x SD - 0.3862
Formula for distance between projector and
Projection distance
(L1) formula
= 0.303 x SD + 0.020 = 0.184 x SH - 0.128
= 0.312 x SD + 0.020 = 0.205 x SH - 0.128
= 0.343 x SD + 0.020 = 0.184 x SH - 0.128
= 0.303 x SD + 0.020 = 0.229 x SH - 0.128
= 0.312 x SD + 0.020 = 0.254 x SH - 0.128
= 0.343 x SD + 0.020 = 0.229 x SH - 0.128
Projection distance (L) formula
4:3
Max. (LT)
= 0.9559 x SD - 0.0736
= 0.9825 x SD - 0.0736
= 1.0822 x SD - 0.0736
= 1.4458 x SD - 0.1085
= 1.4860 x SD - 0.1085
= 1.6367 x SD - 0.1085
= 2.0795 x SD - 0.1162
= 2.1373 x SD - 0.1162
= 2.3542 x SD - 0.1162
= 4.0041 x SD - 0.1765
= 4.1155 x SD - 0.1765
= 4.5330 x SD - 0.1765
= 6.3027 x SD - 0.1615
= 6.4779 x SD - 0.1615
= 7.1351 x SD - 0.1615
= 11.8400 x SD - 0.3598
= 12.1692 x SD - 0.3598
= 13.4039 x SD - 0.3598
screen (A1)
Min. Max.
= 0.283 x SH - 0.128
= 0.370 x SH - 0.128
= 0.283 x SH - 0.128
= 0.283 x SH - 0.128
= 0.370 x SH - 0.128
= 0.283 x SH - 0.128
= 0.6072 x SD - 0.0713
= 0.6240 x SD - 0.0713
= 0.6873 x SD - 0.0713
ENGLISH - 47